Car Audio 8" Powered Subwoofer Box - The SWD-2000 uses an MRP-M350 V-Power Class-D mono amp, and delivers powerful yet tight and accurate bass—and is an excellent easy-to-install upgrade solution for existing factory systems - 350W Peak Power • Frequency Response: 50Hz-200Hz (-24dB/oct.) • 8" (20cm) Cone Woofer • LPF Control • GAIN Control • Speaker/RCA Input • Variable BASS EQ • 4V Input Ready *Bass Engine® Features - Digital Time Correction - For automatically adjusting the time delay of sounds of the subwoofers, delivering maximum sonic impact and correcting bass/mid-bass performance problems due to speaker distance. *Gain Factor - Uses digital processing to enhance the audio input, providing more usable power and a wider range of music control. *Parametric EQ (Bass Centre & Width Control) - Gives you exceptionally detailed and comprehensive adjustment of individual frequencies — even allowing control over frequency width. *Digital Crossover - Especially important in multi-amplifier setups, this allows setting of exact crossover points to maximise the efficiency of each speaker, increase output and improve clarity. *Bass Compensation - Utilises MediaXpander technology to add extra definition and power to the low end. *Subwoofer Level Control - For adjusting the bass just as you like.